/sys$common/syshlp/SYSMANHELP.HLB  —  SHUTDOWN  NODE  Qualifiers  /REBOOT_TIME
       /REBOOT_TIME=time

    The time when you expect to reboot the system such as
    IMMEDIATELY, IN 10 MINUTES, 2 P.M., or 14:00:00. Shutdown
    displays this time in a shutdown message to users.
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